Toward a systematic 1/d expansion: Two particle properties

Preprint

4 February 2000

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.cond-mat/0002073

Abstract

We present a procedure to calculate 1/d corrections to the two-particle properties around the infinite dimensional dynamical mean field limit. Our method is based on a modified version of the scheme of Ref. onlinecite{SchillerIngersent}}. To test our method we study the Hubbard model at half filling within the fluctuation exchange approximation (FLEX), a selfconsistent generalization of iterative perturbation theory. Apart from the inherent unstabilities of FLEX, our method is stable and results in causal solutions. We find that 1/d corrections to the local approximation are relatively small in the Hubbard model.

Keywords

TWO PARTICLE PROPERTIES
PERTURBATION THEORY
1/D CORRECTIONS
SYSTEMATIC 1/D
1/D EXPANSION
APPROXIMATION
HUBBARD

All Related Versions

Version 1, 2000-02-04, ArXiv
Published version: Physical Review B, 62 (24), R16227.

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